Metal-insulator transition in 
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Kondoh, Yuhki; Takei, Ryosuke; Okuda, Takashi; Ueno, Keiji; Katayama, Yumiko; Saiki, Takuo; Sekino, Wataru; Kajita, T.; Katsufuji, T.

doi:10.1103/physrevb.104.125128

Cited by 7 publications

(6 citation statements)

References 25 publications

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“…The single crystal samples of Ba 3 Nb 5−x Ti x O 15 were grown by the floating-zone method as described for Ba 3−x Sr x Nb 5 O 15 system [18]. More details on the preparation and characterization together with the optical conductivity of Ba 3 Nb 5−x Ti x O 15 will be reported elsewhere [21].…”

Section: Methodsmentioning

confidence: 99%

“…For example, Ba 3 Nb 4 TiO 15 , with partial substitution of Ti at the Nb site, is another filled TTB niobate having the potential for controllable thermoelectric response [19]. Ba 3 Nb 5−x Ti x O 15 shows metal-insulator transition (Figure 1) with partial Ti substitution for Nb, very similar to the one found in Ba 3−x Sr x Nb 5 O 15 [16][17][18]. Resistivity measurements, shown in Figure 1, point out a clear evolution of the electric transport properties as a function of Ti concentration from an anisotropic metal for x = 0 to an isotropic insulator at x = 0.7 and 1.0.…”

Section: Introductionmentioning

confidence: 96%

“…The "filled" TTB niobates, with a random occupation of the A1 and A2 structural sites, have also been studied for their dielectric response [15]. Besides, Ba 3−x Sr x Nb 5 O 15 shows metal to insulator transition by partial substitution of Sr, assigned to an increased atomic disorder at Nb 2 O 12 octahedral sites [16][17][18]. Indeed, Ba 3 Nb 5 O 15 is an anisotropic metal that turns to an isotropic insulator by the partial Sr substitution [18].…”

Section: Introductionmentioning

confidence: 99%

“…Besides, Ba 3−x Sr x Nb 5 O 15 shows metal to insulator transition by partial substitution of Sr, assigned to an increased atomic disorder at Nb 2 O 12 octahedral sites [16][17][18]. Indeed, Ba 3 Nb 5 O 15 is an anisotropic metal that turns to an isotropic insulator by the partial Sr substitution [18]. However, a complete understanding of the metal-insulator transition in this class of materials is still under discussion [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, Ba 3 Nb 5 O 15 is an anisotropic metal that turns to an isotropic insulator by the partial Sr substitution [18]. However, a complete understanding of the metal-insulator transition in this class of materials is still under discussion [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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The Local Structure and Metal-Insulator Transition in a Ba3Nb5−xTixO15 System

et al. 2022

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The local structure of the filled tetragonal tungsten bronze (TTB) niobate Ba3Nb5−xTixO15 (x = 0, 0.1, 0.7, 1.0), showing a metal-insulator transition with Ti substitution, has been studied by Nb K-edge extended X-ray absorption fine structure (EXAFS) measurements as a function of temperature. The Ti substitution has been found to have a substantial effect on the local structure, that remains largely temperature independent in the studied temperature range of 80–400 K. The Nb-O bonds distribution shows an increased octahedral distortion induced by Ti substitution, while Nb-Ba distances are marginally affected. The Nb-O bonds are stiffer in the Ti substituted samples, which is revealed by the temperature dependent mean square relative displacements (MSRDs). Furthermore, there is an overall increase in the configurational disorder while the system with Nb 4d electrons turns insulating. The results underline a clear relationship between the local structure and the electronic transport properties suggesting that the metal-insulator transition and possible thermoelectric properties of TTB structured niobates can be tuned by disorder.

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Section: Methodsmentioning

confidence: 99%